Enter a vendor for special stock &

What causes this issue?

Vendor special stocks (special stock indicator &V1&) are managed
separately for each vendor. Consequently, entry of the vendor number is
mandatory in the case of a goods movement or physical inventory.

System Response

Only if you enter the vendor number can the system uniquely identify
the special stock and post the transaction.

How to fix this error?

Enter the vendor number.
If you do not know the vendor number, you can <DS:TRAN.MMBE>display</>
the stock overview for the material.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.